SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1866bb8a71bb16b0540a5c24edfacbce20ad96bd33da040ffcb5e1c6281f032e' 
  AND token = 'HVPBIpHcm/ETWCcrBgslDKz/rGVZ9Z/4JPb3jpKkX9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}